Questions from a Tube Preamp newbie

I have NOS Mullards ECC 82’s , sounds like somebody threw a blanket over my system . Kinda like pushing the Dolby button on a cassette player .

As always, YMMV.
Regarding Mullard and other NOS brands, if they are noise-tested they should sound good for many hours. There are several types of Mullards; longplates, shortplates, ladder plates, with square getter or with halo getter. ECC82 labelled "Made in Great Britain" are of the highest build-quality.

There is a "house sound" to these tubes, warmth with a relaxed top-end (since they are British they should be called valves).
1950’s ECC82 longplate square getters present open and warm sonics with rich textures; I own several pairs. The CV4003 is a military-spec boxplate with a wide soundstage, and to my ears, sound more "lively," whereas the short plate sounds more "closed-in."

Philips tubes made in the UK factory will have the same sonic signature as Mullard. Phillips Holland was the parent company of Mullard and Amperex.

Regarding #4, JJ tubes do not have a good reputation among audio tube people.  However, Rogue may have built their preamp to sound good with them and if it is hard on tubes, JJs may be stout enough to handle the punishment, while other tubes may not.  Best bet is to talk to Rogue about it.   See if they recommend any other tubes. 

rodge827 ++++++++++
Andy has the best tube test equipment on the planet

OP get started with this, no need to wait till your JJ need replaced
you will find it adds an interesting aspect to learning to listen for small differences and sometimes massive change

all for relatively small $ and have others have said get you some spares in the process

NOS Tubes - Go to Brent Jessee! http://www.audiotubes.com

However, I have been amazed with Gold Lion signal tubes, I have no reason to go back to NOS.

Thumbs up to both Brent Jesse and Andy at Vintage Tubes . These places have quality product and a wealth of knowledge . Also of interest is Brent Jesse’s site that explains the sounds of various NOS Tubes . I find the descriptions to be spot on . Also sorry if I ruffled any feathers on my Mullard description . I also appreciate the number of knowledgeable Goners that have chimed in on the New Production Gold Lion Signal Tubes . I have their KT-77’s and KT-88’s and found them to be excellent. Somebody mentioned Cryo ? Was the change noticeable? I also appreciate Wolf and Lowrider . Good info guys , thanks .